Manual for CP 343-1 Lean

Name: Manual for CP 343-1 Lean
Brand: SIEMENS
Availability: InStock

Brand: SIEMENS

Category: Control Unit

Document Type: Manual

Language: EN

Uploaded: Nov. 21, 2025, 9:04 p.m.

Manual Publish Date: 2007-03-01

Warranty Information

None

Application:

The CP 343-1 Lean is a communications processor for SIMATIC S7-300 programmable logic controllers, enabling connection to Industrial Ethernet and supporting PROFINET IO. It features a 2-port switch for easy network integration.

Services Supported:

PROFINET IO device
S7 communication and PG/OP communication (including routing, HMI, and server for data exchange)
S5 compatible communication (SEND/RECEIVE over ISO-on-TCP, TCP, UDP; Multicast; FETCH/WRITE services)
Time-of-day synchronization (SIMATIC mode, NTP mode)
Diagnostic buffer synchronization
Addressing using a factory-set MAC address
SNMP Agent (version V1)
IP configuration
Web diagnostics

Configuration can be done via MPI or Industrial Ethernet using STEP 7 with NCM S7.

Troubleshooting and error codes

SF(red)	BF (red)	RUN (green)	STOP (yellow)	CP Operating Mode
(colored) on	-	(colored) on	(colored) on	Starting up after power "ON" or Stopped (STOP) with errors In this state, the CPU or intelligent modules in the rack remain accessible using PG functions.
(colored) on	(colored) on	(colored) flashing	(colored) on	Starting up (STOP->RUN)
(colored) on	(colored) on	(colored) on	(colored) flashing	Running (RUN)
(colored) on	(colored) on	(colored) flashing	(colored) on	Stopping (RUN->STOP)
(colored) on	(colored) on	off	(colored) on	Stopped (STOP) In the STOP mode configuring and performing diagnostics on the CP remain possible.
-	-	(colored) on	-	No LAN cable plugged in or Duplicate IP address detected
(colored) on	(colored) flashing	(colored) on	(colored) flashing	The CP is configured as a PROFINET IO device; there is no data exchange with the PROFINET IO controller
(colored) flashing	(colored) flashing	(colored) flashing	(colored) flashing	Module fault / system error
(colored) flashing	(colored) flashing	(colored) flashing	(colored) on	Downloading firmware.
(colored) on	(colored) on	(colored) on	(colored) on	Firmware was successfully downloaded.
(colored) flashing	(colored) flashing	(colored) flashing	(colored) flashing	Firmware could not be downloaded.